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Finding the Fourth Proportional to 842.62, 1,263.75 and 257.49

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Solution

The fourth proportional to 842.62, 1,263.75 and 257.49 is: 386.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.62 : 1,263.75 = 257.49 : x
  2. Step 2: Convert to fraction form
    842.62/1,263.75 = 257.49/x
  3. Step 3: Cross multiply
    842.62x = 1,263.75 × 257.49
  4. Step 4: Simplify right side
    842.62x = 325,402.99
  5. Step 5: Solve for x
    x = 325,402.99/842.62
  6. Step 6: Final answer
    x = 386.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.